<template>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model.trim="name" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model.number="age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="gender">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click="add">添加/修改</button>
    </div>
    <div>
      <table
        border="1"
        cellpadding="10"
        cellspacing="0"
        v-show="arr.length > 0"
      >
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(obj, index) in arr" :key="index">
          <td>{{ index + 1 }}</td>
          <td>{{ obj.name }}</td>
          <td>{{ obj.age }}</td>
          <td>{{ obj.gender }}</td>
          <td>
            <button @click="del(index)">删除</button>
            <button @click="change(index)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      name: "",
      age: "",
      gender: "",
      editIndex: null,
      arr: [
        {
          name: "张",
          age: 10,
          gender: "男",
        },
        {
          name: "张",
          age: 10,
          gender: "男",
        },
        {
          name: "张",
          age: 10,
          gender: "男",
        },
      ],
    };
  },
  methods: {
    add() {
      if (!this.name || !this.age) {
        alert("请输入用户名和年龄哦");
        return;
      }
      const a1 = {
        index: this.arr.length + 1,
        name: this.name,
        age: this.age,
        gender: this.gender,
      };
      if (this.editIndex !== null) {
        this.$set(this.arr, this.editIndex, a1);

        this.name = this.age = this.gender = "";
        this.indexNew = null;
      } else {
        this.arr.push(a1), (this.name = this.age = this.gender = "");
        this.indexNew = null;
      }
    },
    change(index) {
      this.name = this.arr[index].name;
      this.age = this.arr[index].age;
      this.gender = this.arr[index].gender;
      this.editIndex = index; //把正在编辑的索引值保存起来
    },
    del(index) {
      this.arr.splice(index, 1);
    },
  },
};
</script>
